Preheat oven to 400 degrees F. Melt the butter and grease the muffin tins. Sift the dry ingredients in a bowl. Mix the milk with the beaten eggs and stir in the melted butter. Combine the two mixtures and mix in blueberries. Spoon into muffin tins about half full. Bake 15-20 min. and turn out immediately. These are wonderful for breakfast or just as a snack and they're healthy too!